Home / 80,886.81-121,767-72,749.10

Finding the Fourth Proportional to 80,886.81, 121,767 and 72,749.10

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Solution

The fourth proportional to 80,886.81, 121,767 and 72,749.10 is: 109,516.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,886.81 : 121,767 = 72,749.10 : x
  2. Step 2: Convert to fraction form
    80,886.81/121,767 = 72,749.10/x
  3. Step 3: Cross multiply
    80,886.81x = 121,767 × 72,749.10
  4. Step 4: Simplify right side
    80,886.81x = 8,858,439,659.70
  5. Step 5: Solve for x
    x = 8,858,439,659.70/80,886.81
  6. Step 6: Final answer
    x = 109,516.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.